This is used only in literary or very formal contexts.

In very formal contexts, however, the vosotros conjugation can still be found.

In a formal context, the d is not dropped.

The choice between the two definitions usually matters only in very formal contexts, like category theory.

He has proposed ways to develop the concept of "total art" in both formal academic and professional contexts.

It is also used in certain formal contexts by bishops and university rectors.

It is never used in a formal context.

However, in less formal contexts, the term "syndrome" is sometimes used instead of sequence.

It is restricted to highly formal contexts, generally relating to politics and government.

Most job titles are derived from this form as they are mostly used in a formal context.